package com.edee.bigday.search.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.edee.bigday.search.config.BigdayElasticSearchConfig;
import com.edee.bigday.search.constant.EsConstant;
import com.edee.bigday.search.feign.CommodityFeignService;
import com.edee.bigday.search.service.ShopSearchService;
import com.edee.bigday.search.vo.AttrResponseVo;
import com.edee.bigday.search.vo.BrandVo;
import com.edee.bigday.search.vo.SearchParam;
import com.edee.bigday.search.vo.SearchResult;
import com.edee.common.to.es.SkuEsModel;
import com.edee.common.utils.R;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class ShopSearchServiceImpl implements ShopSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private CommodityFeignService feignService;

    //去es中检索：
    @Override
    public SearchResult search(SearchParam param) {
        //1、动态构建出查询需要的DSL语句：
        SearchResult result = null;
        //准备检索请求：
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //执行检索请求：
            SearchResponse response = client.search(searchRequest, BigdayElasticSearchConfig.COMMON_OPTIONS);
            //分析响应数据，封装为需要的格式：
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 构建检索请求
     *
     * @param param
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        /**
         * 1、查询：模糊匹配、过滤(按照属性、分类、品牌、价格区间、库存)
         */
        //1、构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must-模糊匹配：
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 boot-filter-按照三级分类Id查询:
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2 boot-filter-按照品牌Id查询：
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2 boot-filter-按照所有指定的属性查询：
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一组属性Id_属性值，都要生成一个nested查询：
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        //1.2 boot-filter-按照是否有库存查询：
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termsQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2 boot-filter-按照价格区间进行查询：
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        //将上述所有查询条件进行封装：
        searchSourceBuilder.query(boolQuery);

        /**
         * 2、排序、分页、高亮
         */
        //2.1 排序：
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            searchSourceBuilder.sort(s[0], order);
        }
        //2.2 分页：
        searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.COMMODITY_PAGESIZE);
        searchSourceBuilder.size(EsConstant.COMMODITY_PAGESIZE);
        //2.3 高亮：
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            searchSourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 3、聚合分析
         */
        //3.1 按照品牌聚合：
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //3.2 品牌聚合的子聚合：
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        searchSourceBuilder.aggregation(brand_agg);

        //3.3 按照分类聚合：
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(50);
        //3.4 分类聚合的子聚合：
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);

        //3.5 按照属性聚合：
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        /*// 3.5.1 聚合分析出所有的attrId：
        TermsAggregationBuilder id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_agg.subAggregation(id_agg);
        // 3.5.2 聚合分析出当前AttrId对应的attrName：
        id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        // 3.5.3 聚合分析出当前AttrId对应的所有可能的属性值attrValue：
        id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));*/
        //上面3.5.1-3的写法还可以如下调整顺序(by Leify)：
        // 3.5.1 聚合分析出所有的attrId：
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        // 3.5.2 聚合分析出当前AttrId对应的attrName：
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        // 3.5.3 聚合分析出当前AttrId对应的所有可能的属性值attrValue：
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        searchSourceBuilder.aggregation(attr_agg);

        String s = searchSourceBuilder.toString();
//        System.out.println("构建的DSL语句：" + s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.COMMODITY_INDEX}, searchSourceBuilder);
        return searchRequest;
    }

    /**
     * 构建检索结果数据
     *
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回查询到的所有商品：
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSONObject.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        result.setCommodities(esModels);
        //2、当前商品涉及到的所有属性信息：
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、获取属性的id：
            long attrId = bucket.getKeyAsNumber().longValue();
            //2、获取属性的名称：
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、获取属性的所有值：
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
            /*for (Terms.Bucket valueBucket : attrValueAgg.getBuckets()) {
                List<String> attrValues = new ArrayList<>();
                String attrValue = valueBucket.getKeyAsString();
                attrValues.add(attrValue);
            }*/
            //上面的for循环也可以使用stream API来解决：
            List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> {
                String attrValue = ((Terms.Bucket) item).getKeyAsString();
                return attrValue;
            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3、当前商品涉及到的所有品牌信息：
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、获取品牌的id：
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //2、获取品牌名称；
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3、获取品牌图片：
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4、当前商品涉及到的所有分类信息：
        //根据debug时看到的response中的数据类型转换为ParsedLongTerms:
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //获取分类id：
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //获取分类名称：
            //根据debug时看到的response中的数据类型转换为ParsedStringTerms:
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        ===============以上数据可从聚合结果获取到==================
        //5、分页信息-页码：
        result.setPageNum(param.getPageNum());
        //6、分页信息-总记录数：
        long totalHits = hits.getTotalHits().value;
        result.setTotal(totalHits);
        //6、分页信息-总页数：
        long totalPages = totalHits % EsConstant.COMMODITY_PAGESIZE == 0 ? totalHits / EsConstant.COMMODITY_PAGESIZE : (totalHits / EsConstant.COMMODITY_PAGESIZE + 1);
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //7、构建面包屑导航功能数据：
        //7.1 构建“属性”的面包屑导航数据：
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.CrumbNavVo> crumbNavVos = param.getAttrs().stream().map(attr -> {
                SearchResult.CrumbNavVo navVo = new SearchResult.CrumbNavVo();
                // 分析每个attrs传过来的查询参数值：
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                //顺便将属性id收集到集合中：
                result.getAttrIds().add(Long.parseLong(s[0]));
                //查询属性名称需要远程调用商品服务：
                R r = feignService.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    //如果返回值正确：
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    //如果返回值错误：
                    navVo.setNavName(s[0]);
                }
                //7.2 取消某个面包屑导航后，跳转到何处？将请求地址的url中将当前条件置空：
                //获取所有的查询条件，去掉当前的条件：
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.bigday.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setCrumbNavs(crumbNavVos);
        }

        //在上述属性面包屑导航数据的基础上添加品牌、分类的面包屑导航数据：
        //品牌面包屑导航：
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.CrumbNavVo> crumbNavs = result.getCrumbNavs();
            SearchResult.CrumbNavVo navVo = new SearchResult.CrumbNavVo();
            navVo.setNavName("品牌");
            //品牌的值需要远程调用Commodity服务查询：
            R r = feignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                //查询成功：
                List<BrandVo> brandVoList = r.getData("brands", new TypeReference<List<BrandVo>>() {
                });
                //遍历获取到的品牌数据：
                StringBuffer stringBuffer = new StringBuffer();
                String replaced = "";
                for (BrandVo brandVo : brandVoList) {
                    stringBuffer.append(brandVo.getBrandName() + ";");
//                    replaced = replaceQueryString(param, brandVo.getBrandId().toString(), "brandId");
                    replaced = replaceQueryString(param, brandVo.getBrandId()+"", "brandId");
                }
                navVo.setNavValue(stringBuffer.toString());
                navVo.setLink("http://search.bigday.com/list.html?" + replaced);
            }
            crumbNavs.add(navVo);
        }
        //TODO 分类面包屑导航：不需要导航取消，不用拼Url。



        return result;
    }

    /**
     * 替换查询字符串
     *
     * @param param
     * @param value
     * @param key
     * @return
     */
    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = "";
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //由于浏览器和java编码存在不一致的情况，文本中的空格经过上述编码后，可能变为加号“+”，需要重新替换为20%
            encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String oldLink = param.get_queryString();
        // '/[?|&](hasStock=1)[&]*/gi'
        String targetString = "&" + key + "=" + encode;
//        String targetString2 = "/[?|&](" + key + "=" + encode+")[&]*/gi";
//        String targetString2 = "&(" + key + "=" + encode+")";
//        System.out.println("原链接：param.get_queryString()："+oldLink+", 需要被替换的字符串：" + targetString);
        String newLink = oldLink.replace(targetString, "");
//        String newLink2 = oldLink.replaceAll(targetString2, "");
//        boolean containsOrNot = oldLink.contains(targetString);
//        boolean containsOrNot2 = oldLink.contains(targetString2);
//        System.out.println("原链接是否包含目标字符串："+containsOrNot);
//        System.out.println("原链接：param.get_queryString()："+oldLink+", 需要被替换的字符串002：" + targetString2);
//        System.out.println("原链接是否包含目标字符串2："+containsOrNot2);
//        System.out.println("newLink："+newLink+",newLink2"+newLink2);
        return newLink;
    }
}
